public override RSize MeasureString(string str, RFont font)
{
if (_useGdiPlusTextRendering)
{
ReleaseHdc();
var fontAdapter = (FontAdapter)font;
var realFont = fontAdapter.Font;
_characterRanges[0] = new CharacterRange(0, str.Length);
_stringFormat.SetMeasurableCharacterRanges(_characterRanges);
var size = _g.MeasureCharacterRanges(str, realFont, RectangleF.Empty, _stringFormat)[0].GetBounds(_g).Size;
if (font.Height < 0)
{
var height = realFont.Height;
var descent = realFont.Size * realFont.FontFamily.GetCellDescent(realFont.Style) / realFont.FontFamily.GetEmHeight(realFont.Style);
#if !MONO
fontAdapter.SetMetrics(height, (int)Math.Round((height - descent + .5f)));
#else
fontAdapter.SetMetrics(height, (int)Math.Round((height - descent + 1f)));
#endif
}
return(Utils.Convert(size));
}
else
{
#if !MONO
SetFont(font);
var size = new Size();
Win32Utils.GetTextExtentPoint32(_hdc, str, str.Length, ref size);
if (font.Height < 0)
{
TextMetric lptm;
Win32Utils.GetTextMetrics(_hdc, out lptm);
((FontAdapter)font).SetMetrics(size.Height, lptm.tmHeight - lptm.tmDescent + lptm.tmUnderlined + 1);
}
return(Utils.Convert(size));
#else
throw new InvalidProgramException("Invalid Mono code");
#endif
}
}